11/3/09-what’s the length of no longer tension? In vertebrates-no longer overlap of actin/myosin-myosin+2 actins-what’s the length of no tension in sarcomeres?-same: myosin + 2 actin-why is there a straight line between point of no tension to point of max tension?-spacing of crossbridges? (myosin heads)-linear-spacing of actin binding sites? –linear-regularly spaced-what happens at the center of myosin filament?-no heads; no cross bridges able to be formed-descending limb from max tension to least tension (from middle to left in pic)-cross bridges swinging in wrong direction-now 0 tension from the shortening side-what length is that, and why?-length of 1 myosin-when myosin is jammed up against the edges of sarcomere-myosin is NOT compressed (even if textbook pic looks like it)-insect asynchronous flight muscle:-each nerve impulse makes muscle contract multiple times-wing beat frequency determined by way that actin/myosin move past each other: myosin able to penetrate through Z bands (via little holes) to super contract-so per 1 AP, there will be mult contractions-resonant frequency: physical prop of any vibrating obj. if given single hit,

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